what is the area of the circle if the diameter is 20
The diameter of a circle is the distance across the circle passing through its center. In order to find the area of the circle when the diameter is 20, we first need to find the radius of the circle, which is half of the diameter.
Radius = Diameter / 2
Radius = 20 / 2
Radius = 10
Now that we have the radius, we can calculate the area of the circle using the formula for the area of a circle:
Area = π * (Radius)^2
Area = π * 10^2
Area = π * 100
Area = 100π
Therefore, the area of the circle when the diameter is 20 units is 100π square units.